Industrial and commercial buildings typically have cleaning services that come in and tidy up at the end of the day. That includes dusting desktops, replenishing bathroom supplies and mopping floors. If people are still in the building, a wet floor sign is used to warn people of the safety hazard wet floors present. If spills happen during the day, it’s a good idea to have mops with wringers and a couple of fold up signs in the cleaning closet just in case.